The advantages of dual grafts for bridging defects are as follows : ( 1 ) mechanical fixation is better than fixation by a single onlay bone graft ; ( 2 ) the two grafts add strength and stability ; ( 3 ) the grafts form a trough into which cancellous bone may be packed ; and ( 4 ) during healing the dual grafts , unlike a single graft , prevent contracting fibrous tissue from compromising transplanted cancellous bone
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